Fast Company‘s exclusive profile of CEO Travis Kalanick reveals that the ride-hailing app serves 2 million rides per day.<p>Just five years in, Uber is the most valuable startup in the world, worth more than $50 billion after its most recent round of funding. It’s arguably the quickest to scale as …

Certainly, one of the most successful entrepreneurs of our time is Peter Thiel, a co-founder of PayPal and now a prominent venture capitalist. He was the first outsider to invest in Facebook, and he manages Founders Fund's $2 billion in assets.<p>We read Thiel's bestselling book, "Zero to One," and …